5.7 Format Strings
20240407
A common standard (based on strftime) for specifying a date format
string will replace any %X special characters with specific
components from the date (and time). For example, based on the result
of a call to the function lubridate::now(), which is
Friday, 9 May 2025, 09:16:38 AM, the format
is %A, %e %B %Y, %H:%M:%S %p.
The format strings that are available include:
%a\(\longrightarrow\) Fri (3 char day name)%A\(\longrightarrow\) Friday (full day name)%b\(\longrightarrow\) May (3 char month name)%B\(\longrightarrow\) May (full month name)%d\(\longrightarrow\) 09 (01-31 leading 0 numeric day of month)%e\(\longrightarrow\) 9 (1-31 numeric day of month)%H\(\longrightarrow\) 09 (00-23 numeric 24 hours)%I\(\longrightarrow\) 09 (01-11 numeric 12 hours)%-I\(\longrightarrow\) 9 (1-11 numeric hours no leading 0)%m\(\longrightarrow\) 05 (01-12 numeric month)%M\(\longrightarrow\) 16 (00-59 numeric minutes)%p\(\longrightarrow\) AM (AM,PM upper morning or afternoon)%P\(\longrightarrow\) am (am,pm lower morning or afternoon)%S\(\longrightarrow\) 38 (00-60 numeric seconds)%-S\(\longrightarrow\) 38 (0-60 numeric seconds no leading 0)%y\(\longrightarrow\) 25 (00-99 2 digit year)%Y\(\longrightarrow\) 2025 (4 digit year)%Z\(\longrightarrow\) AEST (time zone)
A good resource is Fabrizio Musacchio’s strftime Cheat Sheet
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